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signal gated contact closure

cisswtlcisswtl Posts: 5
in London Architect with Soundweb London
Hello,
I am wondering if it is possible to short a contact closure momentarily when a gate is opened, and again when it is closed? If so, how could i go about this? I need to trigger a recording device to start and stop via a momentary contact closure when a signal is playing through the blu.
Thanks.

Comments

  • Dan LynchDan Lynch Posts: 472
    1) Grab the \"Gate Open\" LED from the control panel of the noise gate and drag it onto a Logic Source. They're now linked so the logic source will turn on and off when the gate opens and closes.
    2) Wire from the Logic Source to a Single Pulse Trigger. Set the Off Time to 0 and the On Time to 5. That will make a 1/2 second pulse every time the gate opens.
    3) Wire from the same Logic source into a NOT.
    4) Wire from the NOT into another Single Pulse Trigger with exactly the same settings as the first one. That will create a 1/2 second pulse every time the gate closes.
    5) Wire the outputs of both Single Pulse Triggers into an OR.
    6) Wire the output of the OR to a Logic End.
    7) Drag the Logic End onto a Logic Control Port Output.

    Ta-daa. You get a 1/2 second closure of the control output every time the gate opens or closes. Personally, I think this solution has problems. If you get a flicker of the Gate Open light that is too fast for the logic system, you could end up with the \"off\" pulse never happening. Then, your recorder would be turning off when the gate opens and on when it closes. It would be better if your recorder could take a contact closure for start and an open for stop. Or, if your recorder can take a contact closure for start and a different closure for stop, that would be much safer too. Just replace the OR with a pair of Logic Ends and drag them to two control outputs. Another solution would be if your recorder can accept serial commands. If it can, use a serial trigger in Soundweb London and have it send start and stop commands to the recorder.

    Dan
  • cisswtlcisswtl Posts: 5
    Dan,
    Thanks for the reply, I'm anxious to get this to work now. As for your concerns about being stuck in an open or close state, I think I will be ok if I max out the hold and release on the gate in order to avoid rapid open/close sequences. After all, the gate for this purpose is to trigger the recorder, not to block out noise.
  • Dan LynchDan Lynch Posts: 472
    Oh, if you're not really using the gate as a gate, then just put in a Meter Trigger object instead. The trigger light on the Meter Trigger will turn on when the meter reads 0dB. If you want the light to turn on at a different actual level, just change the meter reference. For a trigger at -40dB, just set the meter reference to -40dB.

    Dan
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